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The percentage change is given by(new value - old value) / old valueFor example, a change from 25 to 27 is (27 - 25) / 25 = 8%Remember that in the answer you get, 1 is equal to 100%. So in the example above, the formula produces .08, which is equal to 8%.
The value of the ones digit in 27 is 7.
8/27
3.375
0.27